CVE-2023-26433 json
When adding an external mail account, processing of IMAP "capabilities" responses are not limited to plausible sizes.
published 2023-06-20 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-30253
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 67%
- public exploits
- 0
- none known
Summary
When adding an external mail account, processing of IMAP "capabilities" responses are not limited to plausible sizes. Attacker with access to a rogue IMAP service could trigger requests that lead to excessive resource usage and eventually service unavailability. We now limit accepted IMAP server response to reasonable length/size. No publicly available exploits are known.
Patch / fix
- open-xchange open-xchange_appsuite_backend 7.10.6, 8.11.0
Exploit prediction
1.15% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
Affected products
- OX Software GmbH OX App Suite
Classification
- Weakness
-
- CWE-400 Uncontrolled Resource Consumption
References
-
documentation.open-xchange.com
/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0002.json
vendor-advisory
-
software.open-xchange.com
/products/appsuite/doc/Release_Notes_for_Patch_Release_6219_7.10.6_2023-03-20.pdf
release-notes
-
seclists.org
/fulldisclosure/2023/Jun/8
mailing-list, third-party-advisory
-
packetstormsecurity.com
/files/173083/OX-App-Suite-SSRF-Resource-Consumption-Command-Injection.html
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2023-26433
- NVD CVE-2023-26433
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.